Is anyone working on the idea of producing a combustion type engine using biological processes? Could enzymes not be used to produce some kind of combustual gas??

Been done: DARPA are already testing bio-fueled recon robots/drones that can gather their own raw bio-mass (primarily vegetation, but I believe that small insects will contribute too) and then 'digest' it to produce energy.

This, being a two-stage process is still a bit inefficient though, as there will be losses between the two stages. Eventually, we'll be able to vat-grow muscles that can be used in place of steam/internal combustion type pistons.

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